Biofuel dihubungkan dgn ramah lingkungan? memang belum tentu coba bayangkan bahan baku biofuel dari kelapa sawit, tanaman jarak dll yg rata2 bukan tanaman keras jika ini sudah jadi industri, artinya apa? banyak lahan hutan tanaman keras yg bakal disulap jadi ladang sawit atau jarak....efeknya tahu sendiri jika hutan berkurang saya lebih melihat biofuel sebagai orang yg cari energi alternatif dibanding energi fosil....
phn On 1/16/08, Rovicky Dwi Putrohari <[EMAIL PROTECTED]> wrote: > > pernah baca artikel dibawah ini ? - Many Biofuels Have More Climate > Impact Than Oil > Banyak yang kaget pastinya, aku sendiri pernah menuliskan keraguan > saya sejak hampir dua tahun lalu disini : > > http://rovicky.wordpress.com/2006/04/17/indonesia-produksi-biodiesel-mulai-2007-environmental-impact-2/ > > We need to re think ! > > RDP > ===== > > Many > http://www.planetark.com/dailynewsstory.cfm/newsid/44555/story.htm > > BEIJING - Most crops grown in the United States and Europe to make > "green" transport fuels actually speed up global warming because of > industrial farming methods, says a report by Nobel prize winning > chemist Paul J. Crutzen. > > The findings could spell particular concern for alternative fuels > derived from rapeseed, used in Europe, which the study concluded could > produce up to 70 percent more planet-warming greenhouse gases than > conventional diesel. > > The study suggested scientists and farmers focused on crops, which > required less intensive farming methods, to produce better benefits > for the environment. > > Biofuels are derived from plants which absorb the planet-warming > greenhouse gas carbon dioxide as they grow, and so are meant as a > climate-friendly alternative to fossil fuels. > > But the new study shows that some biofuels actually release more > greenhouse gases than they save, because of the fertiliser used in > modern farming practices. > > The problem greenhouse gas, nitrous oxide, is more famous as the > dentists' anaesthetic "laughing gas," and is about 300 times more > insulating than the commonest man-made greenhouse gas carbon dioxide. > > "The nitrous oxide emission on its own can cancel out the overall > benefit," co-author Professor Keith Smith told Reuters in a phone > interview. > > The results, published in "Atmospheric Chemistry and Physics > Discussions," were based on the finding that fertiliser use on farms > was responsible for three to five times more such greenhouse gas > emissions than previously thought. > http://www.atmos-chem-phys-discuss.net/7/11191/2007/acpd-7-11191-2007.pdf > > They cast further doubts on the credibility of biofuels as a climate > cure, following the revelation of other unintended side effects such > as rainforest clearance and raised food prices, from competition with > forests and food for land. Brazil and the United States produce most > of the world's bioethanol, as a substitute for gasoline, while the > European Union is the main supplier of biodiesel. > > "FUTILE EXERCISE" > > Using biodiesel derived from rapeseed would produce between 1 and 1.7 > times more greenhouse gas than using conventional diesel, the study > estimated. > > Biofuels derived from sugar cane, as in Brazil, fared better, > producing between 0.5 and 0.9 times as much greenhouse gases as > gasoline, it found. > > Maize is the main biofuels feedstock used in the United States, and > produced between 0.9 and 1.5 times the global warming effect of > conventional gasoline, it said. > > "As it's used at the moment, bioethanol from maize seems to be a > pretty futile exercise," Smith said. > > The study did not account for the extra global warming effect of > burning fossil fuels in biofuel manufacture, or for the planet-cooling > effect of using biofuel by-products as a substitute for coal in > electricity generation. > > "Even if somebody decides that our numbers are too big ... if you add > together the undoubted amount of nitrous oxide that is formed, plus > the fossil fuel usage, with most of the biofuels of today you are not > going to get any benefit," Smith said. > > However, the study did not condemn all biofuels, suggesting that > scientists and farmers should focus on crops needing little > fertiliser, and harvesting methods that were not energy intensive. > > "In future if you use low nitrogen demanding crops, and low impact > agriculture, then we could get a benefit," Smith said. > > The study singled out grasses and woody coppice species -- like > willows and poplars -- as crops with potentially more favourable > impacts on the climate. (Additional reporting by Nigel Hunt in London) > > Story by Emma Graham-Harrison > > Story Date: 28/9/2007 > - > http://tempe.wordpress.com/ > None one right solution ! > No one can monopolize the truth ! > > > > ---------------------------------------------------------------------------- > To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id > To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id > Visit IAGI Website: http://iagi.or.id > Pembayaran iuran anggota ditujukan ke: > Bank Mandiri Cab. Wisma Alia Jakarta > No. Rek: 123 0085005314 > Atas nama: Ikatan Ahli Geologi Indonesia (IAGI) > Bank BCA KCP. 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